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Dry bulb temperature, = 38
Wet bulb temperature, = 18
Relative humidity after adiabatic humidification, = 60%
Dry bulb temperature of cool air, = 5
Wet bulb temperature of cool air, = 2
Mass of cool air, = 2kg
Dry bulb temperature of warm air, = 38
Wet bulb temperature of warm air, = 25
Mass of warm air, = 1kg
By using formulae,
= (values )
= 0.007kg/kg of dry air. (Answer)
=34.33 kJ/kg of dry air. (Answer)
By using psychrometric chart,
Plot the two states on the psychrometric chart using the values of dry bulb temperature and the wet bulb temperature.
Join these two points and divide the line in the ratio 2:1
The value of relative humidity and the enthalpy at that point is the required solution.
Relative humidity (humidity ratio) = 0.0073kg/kg of dry air. (Answer)
Enthalpy of the mixture = 34.35 kJ/kg of dry air. (Answer)
Sensible heat load= 150KW
Latent heat load = 61KW
Dry bulb temperature, = 25
Relative humidity,= 50%
Dry bulb temperature, = 17
We know that,
Room sensible heat factor (RSHF) =
First of all, mark room condition of air i.e. 25 and 50% relative humidity as point 1 on psychrometric chart. Now mark the RSHF value (0.710) on sensible heat factor scale and mark it as point “a”. Now join the point “a” to the alignment circle (26 dry bulb temperature and 50% relative humidity). Now draw a line parallel to the above line from point 1 to point 2 till 17 dry bulb temperature. The wet bulb temperature is noted from point 2.
Wet bulb temperature= 13.7 (Answer)
Relative humidity= 0.0086 kg/kg of dry air. (Answer)
Let volume flow rate be “v”. We know that,
Room sensible heat (RSH) = 0.02044v ()
150 = 0.02044v (25-17)
150 = 0.02044v 8
v= 917.3 (Answer)
As per the given data,
Using the psychrometric chart we have the value of
= 344.827 kg/min.
= 6.3 KW
As per given data,
Mass of air=
= 334.82 kg/min
The refrigeration load =
= 5.56kW (Answer)
Apparatus dew point= 11 (from psychrometric table) (Answer)
Volume of recirculated air= 0.6334.82
= 220 (Answer)
As per given data,
Sensible heat ratio =
= 0.5 (Answer)
Using the psychrometric chart,
Wet bulb temperature= 13.9 (Answer)
Mass of the supply air is given by,
= 7.81 kg/s (Answer)
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